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Message: <blockquote data-quote="FivePoint0" data-source="post: 1230019" data-attributes="member: 19114">Are you saying that after setting the timing to stock base of 10*BTDC with the spout unplugged, your timing is changing when the spout is plugged back in?If so that is correct. When you plug the spout back in the computer will immediately change the timing to 30-40* BTDC.This is normal. Upon pulling the spout back out while the engine is running it should pretty much immediately change back to whatever you tightened down the dizzy bolt when setting the base timing. **If the timing is not back to base when the spout is unplugged then either your spout wiring is closed (grounded or touching each other in the harness somewhere) or possible slippage, either the HB or your dizzy isn't tight enough.I can speak from experience when I say the reluctor wheel inside the dizzy is extremely important.It along with the PIP controls your spark and fuel injection pulse times.You're welcome to unplug the IAC (which is the top plug in front of the TPS) while the engine is running.See how it runs with the IAC unplugged / then plug it back in. Any changes?The MAF and IAC are 2 quick tests you can try to see whether or not a major change is noticed when they are unplugged when the engine is running.</blockquote>